public override Bitmap GetBitmap(int x, int y, Envelope envelope, int zoom)
{
var ts = TileSource;
if (ts == null) return null;
var zoomS = zoom.ToString(CultureInfo.InvariantCulture);
try
{
var index = new TileIndex(x, y, zoom.ToString(CultureInfo.InvariantCulture));
var tc = TileCache;
var bytes = tc != null ? tc.Find(index) : null;
if (bytes == null)
{
var mapVertices = new[]
{
envelope.TopLeft().X, envelope.TopLeft().Y,
envelope.BottomRight().X, envelope.BottomRight().Y
};
double[] viewExtentZ = { 0.0, 0.0 };
Reproject.ReprojectPoints(mapVertices, viewExtentZ, Wgs84Proj, _data.CrsProjectionInfo, 0, mapVertices.Length / 2);
var geogEnv = new Envelope(mapVertices[0], mapVertices[2], mapVertices[1], mapVertices[3]);
bytes = ts.Provider.GetTile(new TileInfo {Extent = ToBrutileExtent(geogEnv), Index = index});
var bm = new Bitmap(new MemoryStream(bytes));
if (tc != null)
{
tc.Add(index, bytes);
}
return bm;
}
return new Bitmap(new MemoryStream(bytes));
}
catch (Exception ex)
{
if (ex is WebException ||
ex is TimeoutException)
{
return ExceptionToBitmap(ex, TileSource.Schema.GetTileWidth(zoomS), TileSource.Schema.GetTileHeight(zoomS));
}
Debug.WriteLine(ex.Message);
}
return null;
}
public Tile[,] GetTiles(Envelope envelope, Rectangle bounds)
{
Coordinate mapTopLeft = envelope.TopLeft();
Coordinate mapBottomRight = envelope.BottomRight();
//Clip the coordinates so they are in the range of the web mercator projection
mapTopLeft.Y = TileCalculator.Clip(mapTopLeft.Y, TileCalculator.MinLatitude, TileCalculator.MaxLatitude);
mapTopLeft.X = TileCalculator.Clip(mapTopLeft.X, TileCalculator.MinLongitude, TileCalculator.MaxLongitude);
mapBottomRight.Y = TileCalculator.Clip(mapBottomRight.Y, TileCalculator.MinLatitude, TileCalculator.MaxLatitude);
mapBottomRight.X = TileCalculator.Clip(mapBottomRight.X, TileCalculator.MinLongitude, TileCalculator.MaxLongitude);
int zoom = TileCalculator.DetermineZoomLevel(envelope, bounds);
Point topLeftTileXY = TileCalculator.LatLongToTileXY(mapTopLeft, zoom);
Point btmRightTileXY = TileCalculator.LatLongToTileXY(mapBottomRight, zoom);
var tileMatrix = new Tile[(int)(btmRightTileXY.X - topLeftTileXY.X) + 1, (int)(btmRightTileXY.Y - topLeftTileXY.Y) + 1];
Parallel.For((int) topLeftTileXY.Y, (int) btmRightTileXY.Y + 1,
y => Parallel.For((int) topLeftTileXY.X, (int) btmRightTileXY.X + 1,
x =>
{
var currTopLeftPixXY = TileCalculator.TileXYToTopLeftPixelXY(x, y);
var currTopLeftCoord =TileCalculator.PixelXYToLatLong((int) currTopLeftPixXY.X,
(int) currTopLeftPixXY.Y, zoom);
var currBtmRightPixXY = TileCalculator.TileXYToBottomRightPixelXY(x,
y);
var currBtmRightCoord =TileCalculator.PixelXYToLatLong((int) currBtmRightPixXY.X,
(int) currBtmRightPixXY.Y, zoom);
var currEnv = new Envelope(currTopLeftCoord, currBtmRightCoord);
var tile = GetTile(x, y, currEnv, zoom);
tileMatrix[x - (int) topLeftTileXY.X, y - (int) topLeftTileXY.Y] =tile;
}
));
return tileMatrix;
}
public Tiles GetTiles(Envelope envelope, Rectangle bounds, BackgroundWorker bw)
{
var mapTopLeft = envelope.TopLeft();
var mapBottomRight = envelope.BottomRight();
//Clip the coordinates so they are in the range of the web mercator projection
mapTopLeft.Y = TileCalculator.Clip(mapTopLeft.Y, TileCalculator.MinLatitude, TileCalculator.MaxLatitude);
mapTopLeft.X = TileCalculator.Clip(mapTopLeft.X, TileCalculator.MinLongitude, TileCalculator.MaxLongitude);
mapBottomRight.Y = TileCalculator.Clip(mapBottomRight.Y, TileCalculator.MinLatitude, TileCalculator.MaxLatitude);
mapBottomRight.X = TileCalculator.Clip(mapBottomRight.X, TileCalculator.MinLongitude, TileCalculator.MaxLongitude);
var zoom = TileCalculator.DetermineZoomLevel(envelope, bounds);
var topLeftTileXY = TileCalculator.LatLongToTileXY(mapTopLeft, zoom);
var btmRightTileXY = TileCalculator.LatLongToTileXY(mapBottomRight, zoom);
var tileMatrix = new Bitmap[(int)(btmRightTileXY.X - topLeftTileXY.X) + 1, (int)(btmRightTileXY.Y - topLeftTileXY.Y) + 1];
var po = new ParallelOptions { MaxDegreeOfParallelism = -1 };
Parallel.For((int)topLeftTileXY.Y, (int)btmRightTileXY.Y + 1, po,
(y, loopState) => Parallel.For((int)topLeftTileXY.X, (int)btmRightTileXY.X + 1, po,
(x, loopState2) =>
{
if (bw.CancellationPending)
{
loopState.Stop();
loopState2.Stop();
return;
}
var currEnv = GetTileEnvelope(x, y, zoom);
tileMatrix[x - (int)topLeftTileXY.X, y - (int)topLeftTileXY.Y] = GetTile(x, y, currEnv, zoom);
}
));
return new Tiles(tileMatrix,
GetTileEnvelope((int)topLeftTileXY.X, (int)topLeftTileXY.Y, zoom), // top left tile = tileMatrix[0,0]
GetTileEnvelope((int)btmRightTileXY.X, (int)btmRightTileXY.Y, zoom) // bottom right tile = tileMatrix[last, last]
);
}